China’s “strictest air protection law” yet took effect on January 1, 2016, promising to bring big changes to its smog-filled cities. But some municipal governments have been ahead of the curve, working to clean up the air through experimentation and innovation. Shenzhen, China’s first special economic zone and which recently passed its neighbor Hong Kong to lead China’s most competitive cities, is one of these.

China’s announcement of a nationwide cap-and-trade program is a sign that the government is serious in its “war against pollution,” says China Environment Forum Director Jennifer Turner, and it may help move the climate change discussion in the United States too.